<span class="monospace">
  <span *ngIf="a.abs().gt(0.01)"
        [class.notEnough]="a.lt(0)">
    {{a | format}}/s
    <sup>3</sup>
  </span>
  <span *ngIf="!b.eq(0)"
        [class.notEnough]="b.lt(0)">
    <span *ngIf=" b.gt(0)">+</span>
    {{b | format}}/s
    <sup>2</sup>
  </span>
  <span *ngIf="!c.eq(0)"
        [class.notEnough]="c.lt(0)">
    <span *ngIf=" c.gt(0)">+</span>
    {{c | format}}/s </span>
</span>
